import java.util.Arrays;
import java.util.HashMap;
import java.util.HashSet;
import java.util.TreeSet;

/**
 * Created with Intellij IDEA.
 * Description:
 * User: 33013
 * Date: 2023-09-21
 * Time: 19:33
 */
public class Test {
    public static void main(String[] args) {
        //Arrays.sort();
        System.out.println();
        HashSet<Character> hash = new HashSet<>();
        //hash.contains();
        StringBuffer stringBuffer = new StringBuffer();
        stringBuffer.toString();
        TreeSet<Integer> set = new TreeSet<>();
        //set.first()
        char[] chs = {'s','s'};
        String str = new String(chs);
        System.out.println(str);

    }
}
